There doesn’t seem to be a way around this right now. We are expecting improvements in this area in C7. Check out this topic, you might find something useful here.
You would think after all this time and probably the number of people using IMacs like me they would fix this. I want to like this software but Im just in and off it all the time because if silly issues like this, Im sure someone would pop in and say buy another monitor . My space isnt large enough as it us.
Im just about weaned off Ableton live so now its between PTS and Cubase